Hello, I have an Audi A3 8P 1.9 TDI 2005. without Fisa. At some point, the opening of the car stopped working for me in the remote control. After replacing the battery, nothing works anymore, only mechanically. I used to have the same thing but it was enough to pull out and insert the batteries. Now I've tried with two new batteries and nothing. I will add that this is my only key. I tried what is in the instructions but I do not know if I did it right because it did not help ... Please advice. Best regards!